Police are investigating a sudden death in the Hayscastle Cross area on Wednesday.
It is understood that a woman in her 80s has died and a person has been arrested in connection with the incident.
A police spokesman said: "Dyfed-Powys Police has arrested a male in connection with a sudden death in a dwelling house in the Hayscastle Cross area of Pembrokeshire.
"Police received a report of the incident at approximately 10am on Wednesday, July 4th.
"Enquiries are ongoing to locate/contact next of kin."